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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cee34ce51ebc6a8fe65d0b225e78c4a7a0d18b854b698bdaa047377a41547e34' 
  AND token = 'vBTbPZdDnhFOkZMVMAjteZzxZ8APk5JgfBvHrVzZchg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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