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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd34d26d4b09b8c9e076ff25c2b7b7d4ceb2fdace7e547ec63ae6b3a983bdcea' 
  AND token = 'x5ewvtSNDqHk1BAA4cpw8xSfa2DPLM9VYA8BbT4vmN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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