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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efed9077dba2516bcd983cf04e2c03cb2ed19831ec3dea5ab77df6f1d6f548c6' 
  AND token = '3M55ev8xUPbOSJKrOwPZFk/r5mp+srifjEveXXNtoQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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