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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0cac9ef66dc7940e77f1c1297e9fddbc00427519e7a9555212ffb493ce2930b' 
  AND token = '1OVHKKIhdTRjpD5MMe11sEofLkY+R04ocdH8h9nx21c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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