SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3fb750aedf085bf2ea4b711932ef2923264c7ac76e806531907ada0182de2806' 
  AND token = 'YIN3JXk/Bwx+Co+Zgym+gtr6817GJmaYNRJlPViIvCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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