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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aa40bc0f418a1e5e051fd9e16b881db05b2f18b92b4fab05bd6e2abeb6fab3d' 
  AND token = 'Bfr4dO/UfuYDYF5JcOqIKOGem43SsLmPYM2MbChT0ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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