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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3db5ec69068c3ee115a83cfee16f4c6145b2c9f54c9c9577115bcaa67ff7f495' 
  AND token = 'vbKm58yI8V7Nt7ivugmE9j5e7eohCigCTYCbS3jG/Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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