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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7ebc6f0be5fa193e66dd1660cf5134da9feaf3d2992698360a8a98637e911b9' 
  AND token = 'bd391O8DdHw7WtqQhrvtv7UKlSaMX134tpjCXyPbM3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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