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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd4535763c9965caab121c5fffe0e880ec0d46b7f729379ef404fb503fb2ace2' 
  AND token = 'rPf9+vDl142MYR7L+R1Pq5aPXFMbuzVE+kQ9g3Ilv6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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