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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9542ba797e1b005f3e1f966eade2baf064ab5e8a971e4e5349d2a16dc4fbb978' 
  AND token = '8Xj1Khr7TRhriyK/kdxvu4j7I0FnUPu93CtyC16eqMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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