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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67b39ac6808d9ed30444d392ec62b142991dd3ed59d01c8fd3a4f5533e0301ac' 
  AND token = 'Kzx/sIfK/m0tEykceVHQF42HP8C+WlvIH0v93giJiBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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