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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ff6075195140063a9ae2dcda9a568a54ef6d00c76d2ac0714a17bb6499022459' 
  AND token = 'o4UeAckrG9rfI+TiUOKhW/BiGsdaSGKoaVrZAXiP6tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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