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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8519266b9f677c6df34e481e8042b0f98f3f877f0a00d64ef567b34f5afb1ba' 
  AND token = 'o6mZtYFgzdcC0a5N1CG2ec/RlB1DVE0qnE5rmQn6TEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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