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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '978cdfd0ef5f90fae9aff0916cb207e669de51b29f29d79d52f64750ec602d68' 
  AND token = '+V9I+hg5AbmVQ9EntjSH2zLzDoJf+Xt3QFhqFRm+Hx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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