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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6f410e49af00b2c9fce16961adc772fa22b97265fe5705ecbf49769574227fb5' 
  AND token = 'aMRSHEBIL8ZwWPMYHMAQVXfDW5JyY26ivBJ0bRKx4/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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