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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '785ccdfc099a3c9513dc32f91cf257981aa3c4874302c9fabfe5e4e6a74c9570' 
  AND token = '0DnYn1z7N7QHdsVrIVpz8/5OE+sAtAK9b34+0xpbGuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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