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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c0e0ac914890798f9b93b74ed9db86c8106e7cf188009a5b4ca3683a7346026b' 
  AND token = 'xOH1gd03TfXWdUafRmeOc/Bp1Jyyegtbwesrf/Soxxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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