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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66633518ae5db6492e963ed0e4d0318b90ee374e95d3e7d8c31a228755cf3e1f' 
  AND token = 'tnurwi3aFeNaPjUgQj8Y19FuTzVPYi2sacRIyD89OC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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