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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '953ae52c51dd33ef2b7fb7c4680554112666a8f3b71f08904f3620e81f5f1d36' 
  AND token = 'gRl17oqFoXTiJRNduIqaHDNEDaPG8yGplvlzkTeevdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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