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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6d4223c45ff9cd782d48a1b0e8f5777538ee12622ebcf0faf3643cd7a072422d' 
  AND token = 'MmN9+vfmzCZdfQHoPlO/TMe2QM+9qaLIO+YeuBuYOk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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