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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6fad4791dc98ae277df04ad77e184a4261ec4027e617168b358512b5c055b177' 
  AND token = 'NkrtwuyNnr02oV1e+cw0UbgUTMTrFmQHpuD3UmAOozo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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