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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3a00e4654beaf4c2e9b635f193cf1fa2021fb63f14506f978894b0df3727b1f' 
  AND token = 'Uc4vf2I/aqnGfACvZ53rSqNZJEaArSnvDFInizeoLyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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