SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '42336742d4561b29d937b28af30455e712cb2fae8d0012181605ab8c09e50040' 
  AND token = 'v2KrS+YXmCjoJaUV5qE+gDL3cn462XY7Th6dmcgtjQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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