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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4be913e03a233756ef4686825e3f46f2083c814a3ff575b3081550eb35303507' 
  AND token = 'gF/KX2Sy7I1OLc+WutYpKPZbZ6xe4DYUWMno1153TY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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