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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b85a9de38c4ea2132a9cc68311893645812237cdb8ecd3224dcf86eea78ccc45' 
  AND token = '9lQ8JiDRF7BA6E9E0aR0MXXdcGE+b/PIi4Bv1d2hnzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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