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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '17dd2556412e2aa13ddc79493850861547cb67bb87d0c4ce5b313f7b7d5ed0c0' 
  AND token = 'M9cpX1I7dTX/f1ospSHNwAkGdCvm5ohcELheg4lKEAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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