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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf0e7c126afe8f3ff6ea38b433a2197c1c8802cf2937fb812276281c69e44c05' 
  AND token = 'EBjpl0VyEvzoIP6wgsIuH6Ouobetdlwf9JAN2vRe+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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