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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eef73debdda4e3a734390d0952057a28c510793fd2e3de246ad811e56b07484b' 
  AND token = 'qGM7Mm4gTYC28kUuLNk2+09fzdS+DjEGm1ydGBUqL+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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