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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a2f4ea0e6de147d8aa97d188043081702aa0e759aebb59eb63e7b875e5654ec' 
  AND token = '6fM5FoHTmS3jfU6ZHepUCfSM7NUqvsg3FBm5KbfpKbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}