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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01e6db7f388e702c97de94d434cc93814d35952a25cfbedcc0341d1367af1a10' 
  AND token = 'EVGyaZR4R1j3R4EfL6QLWewFDB/6m2Dq7ky7gwsLlWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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