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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd32c5e5c1053e87ad077526baf0061ca2fe1fd55729a1fc58013ba3d6884d66' 
  AND token = 'A40WLB38U/3uxWiRPfavxMXi7orXETQ+syeO67NPPa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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