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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9e9e7aeded04e66d6810560f5d746abf87d6619a814f632556c4f3869354093a' 
  AND token = '1u7tzUHP3IOGBE8m4WQ0ylhTOuX4XcyMNi3Lzjl3Maw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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