SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '927bbb55f579c13a2aaac896f4d764017a30f35597b58324fd2ca2bb7415742e' 
  AND token = 'GFpCxsLZgl13JNs1nRsNF65mZxiK/HGjZhb5IvPeeoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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