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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fcf6e1b5fae8deeff3516dc7239f27f4ba3fb33620f545b374f707217f3fef7d' 
  AND token = 'IIuYLNKO6ftrYfWf3OAzah0hR0ucTkFM6u762oQ4D/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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