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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c13750a0e5c6e5bba7090f53f9e26defc4bf14c36b84ce82682586d60c87fc0e' 
  AND token = 'lfGnWhy7yzsuApYm3UPbMbGPUmLZ/ll6AfZGXhyc7/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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