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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '981e13960b33e7cea1bf151188384da012aa7e0f58fcc078a3682494fea7eac1' 
  AND token = 'YdycX1YS0SMwKCTWo7MHN6iWy6ii0a+oKmUVE9bses4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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