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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a0f8bcc7a8601bdcbd018c00c7fc68e8f5d560305d1c3b184f65870bd7a981f' 
  AND token = '41ePgfBAY7F/uGYrb+iOWYnu4MlbDXL0jeb+dwVm2As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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