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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb830e5531c94c4246e52480dbcb0608dfda89a9aa56d863ec38be3c6ea9ee49' 
  AND token = '5Nb/+wCjin0mnelvz7lP1DdjUAseSftdtfgbfgGAH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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