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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef40a65f9e2328b1fc7ed1aa6a2a889134380667f3aa2bcc79466f712f781940' 
  AND token = 'bws8K1h7vzyyYdn7FveLO1LXKQLeQWQPRSsR3ze8F88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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