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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c05f550d5f32ce9df0aad89c5c99c34b73976638f78b4efa8969409712cd8fea' 
  AND token = '7/serisl3qBT3Pds2wYeWBwSiosqVS3sH7Kr+EaHIFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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