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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cdcff929bdca15fb981310cc9e8af47ec28fac70d513ff68ad5e42b02b1e59a' 
  AND token = 'YWbWCu11CYg4W4eJe81qxi0yIov/XsT/uGVNSF8ykIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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