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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e52963624b47f35d3c307912f0d3056bcc6ae94174b486f324bd61fb50dfc9cb' 
  AND token = '8I0bH4kxR9Lx7Cp3h5DMdA8QbjjWbl6uY32tm28E518=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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