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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e30eba76cbcc1b7422b606d03b87f0676f97b247c393420c2cd4c0bfdc1546d6' 
  AND token = '/9LDIAP+5GC4RTvOAX/TwLnsoo0coFAk8xCgSKkzhFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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