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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94096318a4799970c4ca6b96b6c97d6d7f392c6f724abbd3f0b5c0999f312598' 
  AND token = 'V4WoXCaAv6081xzkB8H/qE7CAoQXc2mGN90rjKCYtCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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