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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1e6fb72ff3061c2b293326dfd972e12b656c876d5c1a15bffe6c1c45bc28f3b' 
  AND token = 'dGFYY3nqK7U/xmxQ9hT9nVDC92/3N+MO5e4sN/Nkj40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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