SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e9051be0ecd0eb0c5fdbb0136a8c3644bcc4aff6b9aa4566f7a7c215f2b774b' 
  AND token = 'q1q7Lv/Pwj8yyxEwgVmcn1bNgRtRZr1vHVphzTQaNpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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